Fix translation of univariate Gamma from FriCAS

[mantepse]

Before #25597 we had:

sage: fricas.Gamma(3/2).sage()
1/2*sqrt(pi)

but this is broken in Sage 9.3.

CC: @fchapoton @slel

Component: interfaces

Keywords: fricas

Author: Martin Rubey

Branch/Commit: bec32a1

Reviewer: Thierry Monteil

Issue created by migration from https://trac.sagemath.org/ticket/31858

[mantepse]

comment:1

The problem is that, in src/sage/functions/gamma.py, we have

        GinacFunction.__init__(self, 'gamma', latex_name=r"\Gamma",
                               ginac_name='gamma',
                               conversions={'mathematica':'Gamma',
                                            'maple':'GAMMA',
                                            'sympy':'gamma',
                                            'fricas':'Gamma',
                                            'giac':'Gamma'})

which attaches fricas.Gamma to the bivariate gamma function, not the symbolic function:

sage: lazy_import('sage.libs.pynac.pynac', ['symbol_table'])
sage: symbol_table["fricas"]["Gamma"].parent()
<class 'sage.functions.gamma.Function_gamma_inc'>
sage: gamma
<function gamma at 0x7ff1d6f2b940>

[mantepse]

Branch: u/mantepse/tranlation_of_univariate_gamma_from_fricas_is_broken

[mantepse]

Commit: e785da4

[mantepse]

New commits:

e785da4

fix translation of Gamma

[mantepse]

Author: Martin Rubey

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

bec32a1

add classical doctest

[sagetrac-git]

Changed commit from e785da4 to bec32a1

[sagetrac-tmonteil]

Reviewer: Thierry Monteil

[sagetrac-tmonteil]

comment:6

LGTM.

[vbraun]

Changed branch from u/mantepse/tranlation_of_univariate_gamma_from_fricas_is_broken to bec32a1